Improvement in joiners clamps



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` loiners Clamps.

Patented'luly 21,1874.

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' UNITED STATES PATENT FFICE.

CORNELIUS S. VAN WAGONER, OF BROOKLYN, NEW YORK.

IMPROVEMENT IN JOINERS CLAMPS.

Specification forming part of Letters Patent No. 153,206, dated July 21,1874; application filed February 24, 1874.

To all whom it may concern:

Be it known that I, CORNELIUS S. VAN WAGONER, of Brooklyn, in the countyof Kings and State of New York, have invented an Improvement in J oinersClamps, of which the following is a specification:

My invention relates to an improvement in what is known to the trade asjoiners7 clamps, particularly to that class which have a movable oradjustable arm, on the end of which is 4a screw; and the inventionconsists in forming the mortise in the arm, where the beam passesthrough it, of such a shape as to bring the bearing-points thereofnearer together, and

consequently nearer to the central axial line of the arm.

Figure l is a side elevation of a clamp embodying my invention. Fig. 2is a central vertical section of the same. Fig. 3 is an under-side viewof the arm. Fig. 4 is a section through the line a b in Fig. 3.

A is the beam, provided with central side ribs f, curved at its lowerend, provided with a fixed jaw, g, at its bottom, and a cap, O, at itstop. A cross-section through the beam A on the plane of line 1/ y, Fig.l, will give the cruciform shape shown at J in Fig. 3. B is the arm, oneend of which is provided with a binding-screw, C, having an adjustablehead or presser-plate, Vh, between which and the lxed jaw g any object,E, is held and compressed. The part L of the arm B is enlarged ,andperforated with an opening, J, of a crucilform shape, as shown in Fig.3, and in size a little larger than the beam A, so as to slide easily upand down the latter when held at right angles to it, or in the positionshown in Fig. l. The sides of the opening J in the arm B are not madeparallel all the way through,

as in the usual manner. The two lower lefthand central corners are cutaway at a bevel, as shown in Figs. 3 and 4:, up to about the center ofthe arm, as shown at c to a in Fig. 4., and the two upper right-handcentral corners are cut away in a similar manner, as shown at b to b inthe same ligure. The lower lefthandend c of opening J is also cut awayat a bevel, as shown at t n in plan in Fig. 3, and in section in Fig. 4,while at el it is not cut away. Cutting awaylthe bottom of the openingat t 'n gives a double hold or gripe to that part of the arm, making itless liable to slip on the beam than when it presents a plain at surfaceparallel to the back of the beam. i.

It will been that when an object, E, is placed upon the xed jaw g, inorder to hold it there preparatory to tightening the screw C, we haveonly to push the arm B, slightly inclined, down the beam A, until theobject E is held in place, as shown in Figs. 1 and 2, when it may befurther compressed by turning` the screw C to any extent required. Oneor two reverse turns of the screw C will loosen the hold or gripe of thearm, so that it can be pushed higher up the beam, to release one articlefrom the clamp or to insert another.

I claim as my inventiony The clamp-arm B, provided with the mortise J,and having bearing-points a b and upper and lower bearing-surfaces c d,in combination with the beam A, having side projections f, allconstructed and operating as and for the purpose herein set forth.

C. S. VAN VVAGONER.

Witnesses:

WM. B. HENDENBECK, M. E. HALsEY.

